Because most build systems are quite complicated there are many
places where compiler flags from the environment might be ignored.
The parser verifies that all compiler commands use the correct
hardening flags and thus all hardening features are correctly used.

It's designed to check build logs generated by Debian's
dpkg-buildpackage (or tools using dpkg-buildpackage like pbuilder or
the official buildd build logs) to help maintainers detect missing
hardening flags in their packages.